/*============================================================================= | |
Copyright (c) 2001-2006 Joel de Guzman | |
Copyright (c) 2006 Dan Marsden | |
Distributed under the Boost Software License, Version 1.0. (See accompanying | |
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
==============================================================================*/ | |
#if !defined(BOOST_FUSION_SWAP_20070501_1956) | |
#define BOOST_FUSION_SWAP_20070501_1956 | |
#include <algorithm> | |
#include <boost/fusion/support/is_sequence.hpp> | |
#include <boost/fusion/view/zip_view.hpp> | |
#include <boost/fusion/algorithm/iteration/for_each.hpp> | |
#include <boost/utility/enable_if.hpp> | |
#include <boost/fusion/sequence/intrinsic/front.hpp> | |
#include <boost/fusion/sequence/intrinsic/back.hpp> | |
#include <boost/mpl/and.hpp> | |
namespace boost { namespace fusion { | |
namespace result_of | |
{ | |
template<typename Seq1, typename Seq2> | |
struct swap | |
{ | |
typedef void type; | |
}; | |
} | |
namespace detail | |
{ | |
struct swap | |
{ | |
template<typename Elem> | |
struct result | |
{ | |
typedef void type; | |
}; | |
template<typename Elem> | |
void operator()(Elem const& e) const | |
{ | |
using std::swap; | |
swap(front(e), back(e)); | |
} | |
}; | |
} | |
template<typename Seq1, typename Seq2> | |
typename enable_if<mpl::and_<traits::is_sequence<Seq1>, traits::is_sequence<Seq2> >, void>::type | |
swap(Seq1& lhs, Seq2& rhs) | |
{ | |
typedef vector<Seq1&, Seq2&> references; | |
for_each(zip_view<references>(references(lhs, rhs)), detail::swap()); | |
} | |
}} | |
#endif |